Add 511MN cameras layer

layers/511mn/query.graphql

@@ -0,0 +1,40 @@
+query MapFeatures($input: MapFeaturesArgs!, $plowType: String) {
+  mapFeaturesQuery(input: $input) {
+    mapFeatures {
+      bbox
+      tooltip
+      uri
+      features {
+        id
+        geometry
+        properties
+      }
+      ... on Event {
+        priority
+      }
+      __typename
+      ... on Camera {
+        views(limit: 5) {
+          uri
+          ... on CameraView {
+            url
+          }
+          category
+        }
+      }
+      ... on Plow {
+        views(limit: 5, plowType: $plowType) {
+          uri
+          ... on PlowCameraView {
+            url
+          }
+          category
+        }
+      }
+    }
+    error {
+      message
+      type
+    }
+  }
+}